@punchy has a good take on this question. Our experience was similar. Youngest lucked into a super horse at age 15 and we had the time and $ to do the big 3-Day shows around the Eastern US for about 10 years (kid grew up, horse grew old, life moved on). While we were living the 3-Day life, we kept horse at our farm, and hauled to various trainers for lessons. In the winter, horse went to trainers to improve and keep up his skills. In the spring, back to the show circuit and horse came home. We, as a family, did all the horse related showing work --expecting only coaching on site from the current trainer/instructor.
We found that the “in house” students who boarded at the trainer’s barn, paid for hauling, stayed with the trainer on site or nearby received the lion’s share of attention at shows. Despite the fact that we paid our share of the trainer’s fee --it was clear our kiddo did not receive an equal amount of attention or coaching. Me being me, at an appropriate moment (not at the venue) I pointed this out -and was told that since our kiddo had her parents on site, and the other riders did not, the coach felt his/her attention was needed more by the other riders (talking about hand holding before classes, pep-talks after showing, extra course walking, etc). To my husband, who attended with us, this was viewed as favoritism. He particularly was cross when he had to go find a certain coach to be with our kid at the start box —fellow was seated on a hay bale chatting with another student who didn’t have a run until the afternoon (this was much earlier, the fellow should have been at the start box with our kid).
We always made it clear what we expected from the coach --even so the amount of time spent with our kiddo at venues was less. When she was younger, kid felt “left out” of various stable endeavors hosted by and for the boarding students --making posters for each other and the coach to put on stalls at shows, scrapbook parties to paste pictures of horses into scrapbooks --etc.
However, I expect there was a bit of envy on the part of the in-house students that kiddo had both her parents involved and at every show (DH is great with horses --owned a race horse as a teenager and trained with an uncle).
So my point is that it will always be unfair because people view things differently. After 10 years, kid went to law school (sold her young horse to pay for it, super horse retired with me). She now rides as an ‘in house’ student on a lovely mare, although she hauls her own horse. Her coach is on site, with other students, but she makes sure she has his attention when she needs it.